Abstract

The oldest granitoids of the Kan–Chingiz Complex with quartz diorites, granodiorites, plagiogranites, and granites are dated for the first time in the Chingiz–Tarbagatai region of eastern Kazakhstan. The U‒Pb (ID-TIMS and SIMS) age of granites and plagiogranites is 509 ± 2 and 512 ± 3 Ma, which corresponds approximately to the Early–Middle Cambrian boundary. These data indicate the Early Cambrian age of volcanosedimentary sequences host granitoids. The peculiarities of the composition of granitoids of the Kan–Chingiz Complex point to their formation within an ensimatic island arc.

中文翻译：

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哈萨克斯坦东部成吉兹-塔尔巴加台地区最古老的岛弧花岗岩：年龄和成分特征的证实

摘要

Kan-Chingiz 杂岩中最古老的花岗岩包括石英闪长岩、花岗闪长岩、斜长花岗岩和花岗岩，首次在哈萨克斯坦东部的 Chingiz-Tarbagatai 地区进行了年代测定。花岗岩和斜长花岗岩的U-Pb（ID-TIMS和SIMS）年龄分别为509±2和512±3Ma，大致对应于早中寒武世边界。这些数据表明早寒武世火山沉积序列中存在花岗岩。坎-成吉思杂岩花岗岩成分的特殊性表明它们是在一个充满灵性的岛弧内形成的。